/**
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.codehaus.groovy.antlr;

import antlr.LexerSharedInputState;

/**
 * GRECLIPSE-805 Support for unicode escape sequences
 * @author Andrew Eisenberg
 */
public class UnicodeLexerSharedInputState extends LexerSharedInputState {
    private final UnicodeEscapingReader escapingReader;

    private int prevUnescape;

    public UnicodeLexerSharedInputState(UnicodeEscapingReader in) {
        super(in);
        escapingReader = in; 
    }

    @Override
    public int getColumn() {
        prevUnescape = escapingReader.getUnescapedUnicodeColumnCount();
        return super.getColumn() + prevUnescape;
    }

    @Override
    public int getTokenStartColumn() {
        if (line == tokenStartLine) {
            return super.getTokenStartColumn() + escapingReader.getUnescapedUnicodeColumnCount();
        } else {
            return super.getTokenStartColumn() + prevUnescape;
        }
    }
}